Instrument Transformers

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  • instrument transformers supplied by Trench for customers on all 5 continents every year.

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Electrical instrument transformers transform high currents and voltages to standardized low and easily measurable values that are isolated from the high voltage. When used for metering purposes, instrument transformers provide voltage or current signals that are very accurate representations of the transmission line values in both magnitude and phase. These signals allow accurate determination of revenue billing.

When used for protection purposes, the instrument transformer outputs must accurately represent the transmission line values during both steady-state and transient conditions. These critical signals provide the basis for circuit-breaker operation under fault conditions, and as such are fundamental to network reliability and securit


Instrument transformers used for network control supply important information for determining the state of the operating conditions of the network.

Instrument transformers technology can also empower the grid with auxiliary power supply and highly precise power quality measurements.

Success story

Trench Group will supply eco-friendly Blue instrument transformers to Sweden!

Siemens will equip a 145-kilovolt (kV) substation owned by E.ON Sweden with SF6-free high-voltage products by the middle of 2020. The orders comprise six bays, including circuit breakers for 72.5-kV and 145-kV from Siemens as well as 145-kV instrument transformers from Trench. With these innovative products of the so called "blue portfolio," Siemens and Trench are supporting E.ON Sweden's goal towards a sustainable F-gas free power transmission.

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